Overview
The LP5012PWR, produced by Texas Instruments, is a 12-channel constant-current-sink LED driver. This device is part of the LP50xx family, which includes 9- and 12-channel variants. It is designed to control each LED output with a 12-bit PWM resolution at a 29-kHz switching frequency, ensuring smooth dimming effects and eliminating audible noise. The LP5012PWR features an on-chip oscillator and a two-wire serial I2C interface, making it versatile for various LED lighting applications. The device also includes power-saving modes and phase-shifting PWM to reduce input power budget and current ripple.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2.7 | 5.5 | V | |
| Shutdown Supply Current (VEN = 0 V) | 0.2 | 1 | µA | |
| Standby Supply Current (VEN = 3.3 V, Chip_EN = 0) | 6 | 10 | µA | |
| Normal-mode Supply Current (with 10-mA LED current per OUTx) | 4 | 6 | mA | |
| Power-save Mode Supply Current (all LEDs off duration > tPSM) | 6 | 10 | µA | |
| Maximum Sink Current (OUT0–OUT11, VCC in full range, Max_Current_Option = 0) | 25.5 | mA | ||
| Maximum Sink Current (OUT0–OUT11, VCC ≥ 3.3 V, Max_Current_Option = 1) | 35 | mA | ||
| PWM Switching Frequency | 21 | 29 | kHz |
Key Features
- 12-bit PWM Resolution: Provides smooth dimming effects and eliminates audible noise with a 29-kHz switching frequency.
- Independent Color Mixing and Intensity Control: Each output channel has its own 8-bit color-setting register, allowing for >16 million color combinations per RGB LED module.
- Logarithmic or Linear Dimming Control: Users can configure the dimming scale either logarithmically or linearly through the global Log_Scale_EN register.
- PWM Phase-Shifting: Reduces peak load current and input-current ripple by delaying the activation of LED drivers.
- Ultra-low Quiescent Current: The device enters a power-saving mode when all channels are off for 30 ms, reducing total power consumption to 10 µA.
- I2C Interface: Two-wire serial interface for easy communication with microcontrollers.
- Hardware Address Pins: Allows up to four devices on the same bus.
Applications
- LED Lighting Systems: Suitable for various LED lighting applications, including RGB LED modules, backlighting, and general lighting solutions.
- Display and Signage: Ideal for display panels, signage, and other visual display systems requiring precise color control and dimming.
- Consumer Electronics: Used in smartphones, tablets, and other portable devices where low power consumption and high color accuracy are crucial.
- Automotive Lighting: Applicable in automotive interior and exterior lighting systems that require advanced color mixing and dimming capabilities.
Q & A
- What is the operating voltage range of the LP5012PWR?
The operating voltage range is from 2.7 V to 5.5 V.
- What is the PWM resolution and switching frequency of the LP5012PWR?
The PWM resolution is 12 bits, and the switching frequency is 29 kHz.
- How many color combinations can each RGB LED module achieve with the LP5012PWR?
Each RGB LED module can achieve >16 million (256 × 256 × 256) color combinations.
- What is the power consumption in power-save mode?
The power consumption in power-save mode is 10 µA when all channels are off for 30 ms.
- Does the LP5012PWR support logarithmic or linear dimming control?
Yes, the LP5012PWR supports both logarithmic and linear dimming control, configurable through the global Log_Scale_EN register.
- How many devices can be connected on the same bus using the hardware address pins?
Up to four devices can be connected on the same bus using the hardware address pins.
- What is the maximum sink current per channel in normal mode?
The maximum sink current per channel in normal mode is 25.5 mA (or 35 mA with Max_Current_Option = 1).
- Does the LP5012PWR have an automatic power-saving mode?
Yes, the LP5012PWR implements an automatic power-saving mode to achieve ultra-low quiescent current.
- What is the purpose of the PWM phase-shifting scheme in the LP5012PWR?
The PWM phase-shifting scheme reduces peak load current and input-current ripple by delaying the activation of LED drivers.
- What type of interface does the LP5012PWR use for communication?
The LP5012PWR uses a two-wire serial I2C interface for communication.
